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Home >> Toyota >> 2020 >> Corolla L >> Repair and Diagnosis >> External Pages >> Different car >> Section 324 (Meter / Gauge System (12.3 Inch) - Diagnostic Codes, Symptom Tests & Circuit Tests) >> METER / GAUGE SYSTEM (for 12.3 Inch Display) >> Headup Display Malfunction [09/2024 - ] >> Procedure

Headup Display Malfunction [09/2024 - ]: Procedure

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  1. CHECK FOR DTC 
    1. Check for DTCs.

      Body Electrical > Combination Meter > Trouble Codes 

      Result

      Result  Proceed to
      DTCs are not output A
      DTCs are output B

    Result: 

    B 

    GO TO DIAGNOSTIC TROUBLE CODE CHART 

    Refer to DIAGNOSTIC TROUBLE CODE CHART [09/2024 - ]

    Result: 

    A 

    See step  2

  2. CHECK SYMPTOMS 
    1. Check the problem symptoms.

      Result

      Result Proceed to
      Display position abnormality A
      Display screen abnormality B

    Result: 

    B 

    See step  6

    Result: 

    A 

    See step  3

  3. PERFORM ACTIVE TEST USING GTS 
    1. Perform the Active Test according to the display on the GTS.

      Body Electrical > Combination Meter > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      HUD Display Position Headup display
      (Display position)      		 Up (+3), Up (+2), Up (+1), Center, Down (-1), Down (-2) or Down (-3) -

      Body Electrical > Combination Meter > Active Test 

      Tester Display
      HUD Display Position

      Result

      Result Proceed to
      Active Test can be performed correctly A
      Active Test cannot be performed correctly B

    Result: 

    B 

    REPLACE METER MIRROR SUB-ASSEMBLY 

    Refer to REMOVAL [09/2024 - ]

    Result: 

    A 

    See step  4

  4. INSPECT METER MIRROR SUB-ASSEMBLY 
    1. Check that the meter mirror sub-assembly is correctly installed to the vehicle.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    INSTALL METER MIRROR SUB-ASSEMBLY 

    Result: 

    OK 

    See step  5

  5. ADJUST METER MIRROR SUB-ASSEMBLY (DISPLAY POSITION SETTING) 
    1. Adjusts headup display position using the customize setting.

      Refer to CUSTOMIZE PARAMETERS [09/2024 - ]

      Result

      Result Proceed to
      Problem symptoms disappear A
      Problem symptoms do not disappear B

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK 

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ]

    Result: 

    B 

    REPLACE COMBINATION METER ASSEMBLY 

    Refer to REMOVAL [09/2024 - ]

  6. PERFORM ACTIVE TEST USING GTS 
    1. Perform the Active Test according to the display on the GTS.

      Body Electrical > Combination Meter > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Color Test Screen (Black) Headup display
      (Black color display)      		 ON -
      Color Test Screen (White) Headup display
      (White color display)      		 ON -
      Color Test Screen (Red) Headup display
      (Red color display)      		 ON -
      Color Test Screen (Green) Headup display
      (Green color display)      		 ON -
      Color Test Screen (Blue) Headup display
      (Blue color display)      		 ON -
      Color Test Screen (Color Bars) Headup display
      (Color bars)      		 ON -
      Liquid Crystal Display Backlight Brightness Headup display
      (display brightness)      		 0 to 100% -

      Body Electrical > Combination Meter > Active Test 

      Tester Display
      Color Test Screen (Black)

      Body Electrical > Combination Meter > Active Test 

      Tester Display
      Color Test Screen (White)

      Body Electrical > Combination Meter > Active Test 

      Tester Display
      Color Test Screen (Red)

      Body Electrical > Combination Meter > Active Test 

      Tester Display
      Color Test Screen (Green)

      Body Electrical > Combination Meter > Active Test 

      Tester Display
      Color Test Screen (Blue)

      Body Electrical > Combination Meter > Active Test 

      Tester Display
      Color Test Screen (Color Bars)

      Body Electrical > Combination Meter > Active Test 

      Tester Display
      Liquid Crystal Display Backlight Brightness

      Result

      Result Proceed to
      Active Test can be performed correctly A
      Active Test cannot be performed correctly B

    Result: 

    B 

    REPLACE METER MIRROR SUB-ASSEMBLY 

    Refer to REMOVAL [09/2024 - ]

    Result: 

    A 

    See step  7

  7. INSPECT NO. 1 COMBINATION METER MIRROR PLATE 
    1. Disconnect the No. 1 combination meter mirror plate from the meter mirror sub-assembly.

      Refer to DISASSEMBLY [09/2024 - ]

    2. Check that the No. 1 combination meter mirror plate is operating normally.

      HINT: 

      If there is a malfunction such as severe deformation, damage or haze, replace the No. 1 combination meter mirror plate as it may adversely affect the display.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE NO. 1 COMBINATION METER MIRROR PLATE 

    Refer to DISASSEMBLY [09/2024 - ]

    Result: 

    OK 

    See step  8

  8. ADJUST METER MIRROR SUB-ASSEMBLY (DISPLAY IMAGE SETTING) 
    1. Adjusts headup display image using the customize setting.

      Refer to CUSTOMIZE PARAMETERS [09/2024 - ]

      Result

      Result Proceed to
      Problem symptoms disappear A
      Problem symptoms do not disappear B

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK 

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ]

    Result: 

    B 

    REPLACE COMBINATION METER ASSEMBLY 

    Refer to REMOVAL [09/2024 - ]

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